Built-in liquid injection cooling medical abrasive drill

Abstract

One end of a linear rotating shaft is fixedly connected with a grinding head, the other end of the linear rotating shaft is fixedly connected with a driving connecting shaft, the linear rotating shaft is sleeved with a wear-resistant guide sleeve, the wear-resistant guide sleeve is sleeved with an inner guide pipe, the inner guide pipe is installed in a fixed outer pipe, at least one axial liquid inlet plane is arranged on the outer circle of the inner guide pipe, and the outer circle of the inner guide pipe is provided with an axial liquid outlet plane. An axial liquid injection channel is formed between the axial liquid inlet plane and an inner hole of the fixed outer pipe, the liquid injection pipe is communicated with the axial liquid injection channel, and a protection plate is arranged at the end, close to the grinding head, of the fixed outer pipe. According to the structure, the rotating friction resistance and temperature rise of the linear rotating shaft can be reduced. A liquid injection pipe does not need to be additionally arranged, so that the product structure and the radial size of the product are simplified, and the requirements of minimally invasive surgery can be better met. The protective plate not only can prevent the cooling liquid from splashing when the grinding head rotates, but also can prevent damage to extraterritorial tissues caused by accidental movement in operation, and can provide a more focused visual range for precise operation, so that the accuracy of the grinding and drilling operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a medical grinding drill. Background Art

[0002] When performing surgery on bone-related diseases such as head diseases, intervertebral disc herniation, spinal stenosis, and bone hyperplasia, orthopedic instruments such as micro-drills are required. However, bone minimally invasive surgery is performed in a non-exposed, closed, and narrow space. A large amount of heat is generated when grinding and removing bone. However, the thermal conductivity of bone is low and the heat cannot be removed in time, which will cause local high temperature of the bone and damage the peripheral nerves. Although bone cells have the ability to self-repair after injury, medical personnel in this field know that when the temperature is higher than 47°C and lasts for more than one minute, the temperature is higher than 55°C and lasts for more than 30 seconds, and the temperature exceeds 70°C, the bone will suffer irreversible thermal damage, which will prolong the patient's postoperative recovery time. In order to reduce the temperature of the drill in minimally invasive surgery, the CN212037914U patent discloses a "low-temperature spray cooling device for cooling the drill". The low-temperature spray cooling device is provided with cooling pipes and flow control valves and other devices to control the flow of saline mist to cool the drill temperature in the endoscope. The low-temperature spray saline achieves a certain degree of reduction in the drill temperature. However, this technical solution still has the following problems: since low-temperature spray cooling reduces the amount of coolant used, the cooling effect is limited, and it is difficult to control the temperature below the temperature at which thermal damage to the bone occurs; at the same time, the atomized saline will blur the endoscopic field of view of minimally invasive surgery, making it difficult for doctors to distinguish between lesions and healthy bone tissue, and precise drilling cannot be achieved; furthermore, due to the hydrophilicity and agglomeration of bone chips, the atomized water droplets easily cause the bone chips to agglomerate and adhere to the surface of the drill, causing the drill surface to become blocked, causing slippage during the drilling process, and accidentally injuring surrounding nerve tissue.

[0003] The "visual medical drilling device" is disclosed in the CN111000614A patent. Although a water outlet and a water inlet are provided, flowing saline is used for irrigation and cooling during the drilling process. The device has grinding and visual functions, and can provide doctors with an operating field of view to a certain extent, thereby achieving safe drilling. However, this technology has the following problems: saline is used for cooling during drilling, and a large amount of saline can take away most of the heat accumulated in the local bone, but the operating space for minimally invasive spinal surgery is narrow and cannot accommodate the amount of cooling saline. After the hydrophilic bones aggregate, the grinding heat causes the aggregated bone chips to undergo a Medela chemical reaction under the catalysis of sodium ions in the saline, generating pseudomelanin that makes the bone chips yellow and hard; the yellow and hard bone chips are embedded in the surface of the drilling under the action of the grinding force and are difficult to fall off, making it difficult for the saline to enter the grinding area to play a cooling role.

[0004] In both of the above solutions, a special infusion pipeline needs to be set up, otherwise a special cooling infusion tube must be added for liquid injection cooling. The product structure is complex, the manufacturing technology is difficult, and the surgical control is more difficult. Utility Model Content

[0005] In view of the above-mentioned current technical status, the utility model provides a medical drill with built-in liquid injection cooling. The use of this medical drill with built-in liquid injection cooling for bone drilling can completely solve the problem of irreversible thermal damage caused by high temperature of the drill.

[0006] The utility model adopts the following technical means to achieve the above technical purpose.

[0007] A medical bur with built-in liquid injection cooling comprises a grinding head, an inner guide tube, a fixed outer tube and a liquid injection tube. The inner guide tube is coaxially installed in the fixed outer tube. At least one axial liquid inlet plane is provided on the outer circle of the inner guide tube. An axial liquid injection channel for flowing to the grinding head is formed between the axial liquid inlet plane and the inner hole of the fixed outer tube. The liquid inlet end of the axial liquid injection channel is communicated with the liquid injection tube, and the liquid outlet end of the axial liquid injection channel corresponds to the grinding head.

[0008] Furthermore, it also includes a linear rotating shaft, a wear-resistant guide sleeve, a bearing, a drive connecting shaft and a handle. The exposed end of the linear rotating shaft is fixedly connected to the grinding head, the linear rotating shaft is sleeved in the wear-resistant guide sleeve, the other end of the linear rotating shaft is fixedly connected to the drive connecting shaft, the wear-resistant guide sleeve is sleeved in the inner guide tube, the inner guide tube is coaxially installed in the fixed outer tube, the wear-resistant guide sleeve, the inner guide tube and the fixed outer tube constitute a composite guide body of the linear rotating shaft, the composite guide body is fixedly installed on the handle, the drive connecting shaft is fixedly installed on the handle through a bearing, there is an axial gap between the drive connecting shaft and the composite guide body, at least one axial liquid inlet plane is provided on the outer circle of the inner guide tube, an axial injection channel is formed between the axial liquid inlet plane and the inner hole of the fixed outer tube, the injection tube is sealingly installed on the composite guide body, and the injection tube is communicated with the axial injection channel.

[0009] Furthermore, a guard plate is provided at one end of the fixed outer tube close to the grinding head.

[0010] Furthermore, among the axial liquid inlet planes provided on the outer circle of the inner guide tube, there is an axial liquid inlet plane that is in the same phase with the guard plate on the fixed outer tube. An axial liquid injection channel is formed between this axial liquid inlet plane and the inner hole of the fixed outer tube, leading to the gap formed by the grinding head and the guard plate. This can ensure that the grinding head can be fully flushed with coolant during grinding, preventing the grinding drill bit from being blocked due to the agglomeration and adhesion of bone chip protein generated during the grinding process.

[0011] Furthermore, the inner side surface of the guard plate is a spherical surface, and the coverage angle of the guard plate to the grinding head is 60 degrees to 120 degrees.

[0012] Furthermore, 2 to 3 axial liquid inlet planes are provided at intervals along the circumferential direction on the outer circle of the inner conduit, and at least one circumferential groove is provided along the axial direction, and the circumferential groove is communicated with all axial liquid injection channels.

[0013] Furthermore, a socket hole is provided at the center of the connection end of the driving connection shaft for realizing driving connection with the motor main shaft in a plug-in manner.

[0014] Furthermore, the cross-sectional shape of the connector is a regular polygon.

[0015] Compared with the prior art, the utility model achieves the following beneficial effects:

[0016] ① Adding a wear-resistant guide sleeve between the linear shaft and the inner guide tube can reduce the rotational friction resistance of the linear shaft and reduce the friction temperature rise.

[0017] ② At least one axial liquid inlet plane is provided on the outer circle of the inner catheter, and an axial liquid injection channel is formed between the axial liquid inlet plane and the inner hole of the fixed outer tube. The liquid injection tube is sealed and installed on the composite guide body, and the liquid injection tube is connected to the axial liquid injection channel. In this way, there is no need to add an additional liquid injection tube, which simplifies the product structure, does not increase the radial size of the product, can achieve miniaturization of the product, and can better meet the requirements of minimally invasive surgery.

[0018] ③ A guard plate corresponding to the grinding head is provided at one end of the fixed outer tube near the grinding head. This can prevent damage to extra-domain tissues due to accidental movement during operation. It can also provide a focused visual range for medical personnel to perform precise surgery, improve the accuracy of the grinding and drilling operation, and thus increase the success rate of a single operation.

[0019] Among the axial liquid inlet planes provided on the outer circle of the inner guide tube, there is an axial liquid inlet plane that is in the same phase with the guard plate on the fixed outer tube. An axial liquid injection channel is formed between the axial liquid inlet plane and the inner hole of the fixed outer tube, leading to the gap formed by the grinding head and the guard plate. This can ensure that the grinding head can be fully flushed with coolant during grinding, preventing the grinding drill bit from being blocked due to the agglomeration and adhesion of bone chip protein generated during the grinding process. The setting of the guard plate can also prevent the splashing of coolant when the grinding head rotates.

[0020] ④ A polygonal socket is provided at the center of the connecting end of the driving connecting shaft, so as to facilitate the plugging of the motor main shaft and realize the convenient connection and removal of the motor and the driving connecting shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the medical grinding drill of the present utility model.

[0022] Figure 2 for Figure 1 Enlarged view of the AA section.

[0023] Figure 3 The schematic diagram is a structural diagram of two axial liquid injection channels provided on the outer circumferential surface of the inner conduit.

[0024] Figure 4 The schematic diagram is a structural diagram of an inner conduit having two axial liquid inlet planes and a circumferential groove on the outer circular surface.

[0025] In the figure: 1-grinding head; 2-linear rotating shaft; 3-wear-resistant guide sleeve; 4-inner guide tube; 5-fixed outer tube; 6-liquid injection tube; 7-bearing; 8-driving connecting shaft; 9-handle; 10-axial liquid injection channel; 41-axial liquid inlet plane; 42-circumferential groove; 51-guard plate; 81-connecting hole. DETAILED DESCRIPTION

[0026] The following is an example of the specific implementation of the present invention with reference to the accompanying drawings:

[0027] Embodiment 1: A medical bur with built-in liquid injection cooling, such as Figure 1 , 2 As shown, it includes a grinding head 1, a linear shaft 2, a wear-resistant guide sleeve 3, an inner guide tube 4, a fixed outer tube 5, an injection tube 6, a bearing 7, a drive connecting shaft 8, a handle 9 and an axial injection channel 10. The exposed end of the linear shaft 2 is fixedly connected to the grinding head 1, the linear shaft 2 is sleeved in the wear-resistant guide sleeve 3, the other end of the linear shaft 2 is fixedly connected to the drive connecting shaft 8, the wear-resistant guide sleeve 3 is sleeved in the inner guide tube 4, the inner guide tube 4 is coaxially installed in the fixed outer tube 5, the wear-resistant guide sleeve 3, the inner guide tube 4, the fixed outer tube 5, the bearing 7, the drive connecting shaft 8, the handle 9 and the axial injection channel 10. The tube 5 constitutes a composite guide body of the linear rotating shaft 2, and the composite guide body is fixedly mounted on the handle 9. The drive connecting shaft 8 is fixedly mounted on the handle 9 through the bearing 7. There is an axial gap between the drive connecting shaft 8 and the composite guide body. An axial liquid inlet plane 41 is provided on the outer circle of the inner guide tube 4. An axial liquid injection channel 10 flowing to the grinding head 1 is formed between the axial liquid inlet plane 41 and the inner hole of the fixed outer tube 5. The injection tube 6 is sealedly mounted on the composite guide body, and the injection tube 6 is communicated with the axial injection channel 10.

[0028] A guard plate 51 is provided at one end of the fixed outer tube 5 near the grinding head 1. The inner side of the guard plate 51 is a spherical surface, and the coverage angle of the grinding head 1 is 60 degrees to 120 degrees. A polygonal socket 81 is provided at the center of the connecting end of the driving connecting shaft 8, which is used to achieve drive connection with the motor spindle in a plug-in manner. The material of the wear-resistant guide sleeve 3 is tetrafluoro plastic, which is wear-resistant, self-lubricating, and has good heat insulation performance.

[0029] Embodiment 2: The difference from Embodiment 1 is that: 2-3 axial liquid inlet planes 41 are provided at intervals along the circumferential direction on the outer circle of the inner conduit 4, and a circumferential groove 42 is provided along the axial direction, and the circumferential groove 42 is communicated with all axial liquid injection channels 10. Figure 1 , Figure 3and Figure 4 .

[0030] The above embodiments only express two preferred implementations of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, without departing from the concept of the utility model, several modifications and improvements made by those skilled in the art are all within the scope of protection of the utility model.

Claims

1. A medical bur with built-in liquid injection cooling, characterized by: The invention comprises a grinding head (1), an inner guide tube (4), a fixed outer tube (5) and a liquid injection tube (6); the inner guide tube (4) is coaxially mounted in the fixed outer tube (5); at least one axial liquid inlet plane (41) is provided on the outer circle of the inner guide tube (4); an axial liquid injection channel (10) for flowing liquid to the grinding head (1) is formed between the axial liquid inlet plane (41) and the inner hole of the fixed outer tube (5); the liquid inlet end of the axial liquid injection channel (10) is communicated with the liquid injection tube (6); and the liquid outlet end of the axial liquid injection channel (10) corresponds to the grinding head (1).

2. The medical bur with built-in liquid injection cooling according to claim 1 is characterized in that: The invention comprises a grinding head (1), a linear rotating shaft (2), a wear-resistant guide sleeve (3), an inner guide tube (4), a fixed outer tube (5), an injection tube (6), a bearing (7), a drive connecting shaft (8) and a handle (9), wherein the exposed end of the linear rotating shaft (2) is fixedly connected to the grinding head (1), the linear rotating shaft (2) is sleeved in the wear-resistant guide sleeve (3), the other end of the linear rotating shaft (2) is fixedly connected to the drive connecting shaft (8), the wear-resistant guide sleeve (3) is sleeved in the inner guide tube (4), the wear-resistant guide sleeve (3), the inner guide tube (4) are fixedly connected to the grinding head (1), and the wear-resistant guide sleeve (3) and the inner guide tube (4) are fixedly connected to the grinding head (1). ), a fixed outer tube (5) and a composite guide body of a linear rotating shaft (2), the composite guide body being fixedly mounted on a handle (9), a driving connecting shaft (8) being fixedly mounted on the handle (9) via a bearing (7), an axial gap being present between the driving connecting shaft (8) and the composite guide body, an axial liquid injection channel (10) being formed between an axial liquid inlet plane (41) and an inner hole of the fixed outer tube (5), an injection tube (6) being sealingly mounted on the composite guide body, and the injection tube (6) being communicated with the axial injection channel (10).

3. The medical bur with built-in liquid injection cooling according to claim 2 is characterized in that: A guard plate (51) is provided at one end of the fixed outer tube (5) close to the grinding head (1).

4. The medical bur with built-in liquid injection cooling according to claim 3 is characterized in that: Among the axial liquid inlet planes (41) provided on the outer circumference of the inner guide tube (4), there is an axial liquid inlet plane (41) which is in the same phase as the guard plate (51) on the fixed outer tube (5). An axial liquid injection channel (10) is formed between the axial liquid inlet plane (41) and the inner hole of the fixed outer tube (5) and leads to the gap formed by the grinding head (1) and the guard plate (51). This ensures that the grinding head (1) can be fully flushed with coolant during grinding, thereby preventing the grinding head (1) from being blocked due to the aggregation and adhesion of bone chip proteins generated during the grinding process.

5. The medical bur with built-in liquid injection cooling according to claim 3 is characterized in that: The inner side surface of the guard plate (51) is a spherical surface, and the covering angle of the guard plate (51) to the grinding head (1) is 60 degrees to 120 degrees.

6. The medical bur with built-in liquid injection cooling according to claim 2 is characterized in that: Two to three axial liquid inlet planes (41) are provided at intervals along the circumferential direction on the outer circle of the inner conduit (4), and at least one circumferential groove (42) is provided along the axial direction. The circumferential groove (42) is communicated with all axial liquid injection channels (10).

7. The medical bur with built-in liquid injection cooling according to claim 2 is characterized in that: A socket hole (81) is provided at the center of the connection end of the drive connection shaft (8) for realizing drive connection with the motor main shaft in a plug-in manner.

8. The medical bur with built-in liquid injection cooling according to claim 7 is characterized in that: The cross-sectional shape of the connecting hole (81) is a regular polygon.

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